高中英语 Unit2 Healthy Eating Grammar课件 新人教版必修3 课件.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unit 2,Healthy eating,Grammar,Find the sentences containing modal verbs in the reading passage.,Then by lunchtime they,would,all be,sold.,What,could,have happened?,Nothing,could,be better.,Something terrible,must,have happened if,He,could not,believe his eyes.,Perhaps he,should,go to the library and find out.,He,had better,do some research!,Even though her customers,might,get thin after eating Yong,Huis,food,They,would,become tired very quickly.,a.should,ought to,都可表示“应该”。,ought to,用于,表示按道理应当,，常指,客观的义务或责任,，,大多数情况下可用,should,代替，但比,should,语气重,。,I,should,help her because she is in trouble.,You,ought to,take care of the baby.,Modal verbs,b.,表示劝告、建议或命令时，,should,和,ought to,可通用,，但在,疑问句中常用,should,。,ought to,的否定式为,oughtnt to,或,ought not to,。,You,should/ought to,go to class right away.,Should,I open the window?,What,should,we do next?,c.,should,ought to,都可表示推测。,He,ought to/should,be home by now.,This is where the oil,ought to/should,be.,注意,should,和,ought to,后面跟动词不定式的完成式,其肯定句表示“过去应该做而未做”,其否定句则表示“过去不该做但做了”。,You,should/ought to have,made the decision a week ago.,I,shouldnt have made,such a foolish mistake.,多数情况下，,ought to,可与,should,互换使用。,ought to,的反意疑问句用,shouldnt,替代。,You ought to have helped him with his English,_?,A.wont you,B.ought not you,C.shouldnt you,D.wouldnt you,2.must,和,have to,must,的用法,1),表示主观的义务和必要,主要用于肯定句和疑问句,意思为“必须,，得,，要,”,；由,must,引起的疑问句，肯定回答要用,must,或,haveto,否定回答要用,neednt,或,donthaveto,意思是“不必”；,must,的否定形式,mustnt,表示禁止，意思是“不能，不许”。如：,Must,Ifinishthetaskrightnow?,我现在必须完成这个工作吗？,Yes,you,must,./Yes,youhaveto.,是的。,(No,you,neednt,./No,you dont have to.,不，不必。,),You,mustnt,come here without permission.,未经允许，你不能来这儿。,haveto,的用法,1)must,表示一种主观的需要，而,haveto,表示一种客观的需要，意思是“不得不”。如：,I,have to,attend an important meeting this afternoon.,今天下午我不得不参加一个重要的会议。,Mother is out,so I,have to,look after the shop.,妈妈不在家，因此我不得不照看商店。,2)haveto,的否定形式是,dont have to,相当于,neednt,。如：,They dont,have to,buy a computer at present.,他们目前没有必要买电脑。,The boss has given everyone a special holiday,so we _ go to work tomorrow.A.cant B.mustnt,C.neednt D.shouldnt,【,点拨,】,考查情态动词。根据题意,可知这里表示“没有必要”,故只能选,C,项。,What do you think we can do for our aged parents?,You _ do anything except to be with them and be yourself.,A.dont have to B.oughtnt to,C.mustnt D.cant,【,点拨,】,根据题意“除了和他们呆在一起做你自己外,没有必要做任何事情。”可知这里选择,dont have to,表示“不必”。,故选,A,项。,3.must,和,need,need,作情态动词时,只能用于疑问句和否定句。构成否定句和疑问句时不借助于助动词,do,。,Need,I finish the work today?,Yes,you,must,./No,you,neednt,.,b.,must,的肯定形式表示“必须”，否定式表示“禁止、严禁”。,You,must,come here.,You,mustnt,take the book away from,the library.,Choose suitable modal verbs below to complete the following dialogues.,ought/oughtnt to should/shouldnt will,mustnt neednt (dont)have to can/cant,1.Sam:How can I grow thinner,Mum?,Mum:Well,you _ eat food with,plenty of,fibre,that helps you,digest better.And you _ stop,drinking cola or eating sweet food.,have to,should,Discovering useful structures,Sam:Does it mean I _ eat my,favourite fried chicken any more?,Mum:Not exactly,if you love fried,chicken,you _ give it up.,Just eat it less often.You,_,worry too much:a little fried,chicken _ do you good!,shouldnt,neednt,dont have to/neednt/shouldnt,will,2.Doctor:You are sick because youve,eaten poisonous mushrooms.,Where did you get them?,Lucy:I picked them in the forest.I know,we _ eat fresh vegetables.,Doctor:Oh,but you _ eat them,until youre sure they are not,poisonous.,Lucy:Thank you,doctor.Ill be more,careful next time.,have to,mustnt,3.Charles:I wish I could see things,clearly in the dark.,Tom:Eating carrots _ help,you see better.You _ eat,some every day.,ought to,should,从,A,、,B,、,C,、,D,四个选项中，选出可以填入空白处的最佳选项。,1.I dont really like James.Why did you invite him?,Dont worry.He _ come.He said he wasnt certain what his plans were.(,北京,2011),A.must not B.need not,C.would not D.might not,高考链接,2.I _ worry about my weekend I always have my plans ready before it comes.(,上海,2011),A.cant B.mustnt,C.darent D.neednt,3.Hows your new babysitter?,We _ ask for a better one.All our kids love her so much.(,浙江,2011),A.should B.might,C.mustnt D.couldnt,4.You _ buy a gift,but you can if you want to.(,湖南,2010),A.must B.mustnt,C.have to D.dont have to,5.May I take this book out of the reading room?,No,you _.You read it in here.(,陕西,2010),A.mightnt B.wont,C.neednt D.mustnt,6.I _ have watched that movie itll give me horrible dreams.(,山东,2010),A.shouldnt B.neednt,C.couldnt D.mustnt,7.Mark _ have hurried.After driving at top speed,he arrived half an hour early.(,天津,2010),A.neednt B.wouldnt,C.mustnt D.couldnt,8.When I was young,I was told that I _ play with matches.(,上海,2008,春,),A.wouldnt B.neednt,C.mustnt D.darent,9.What sort of house do you want to have?Something big?,Well,it _ be big thats not important.(,陕西,2008),mustnt B.neednt,C.cant D.wont,10.What do you think we can do for our aged parents?,You _ do anything except to be with them and be yourself.(,重庆,2007),A.dont have to B.oughtnt to,C.mustnt D.cant,11.The boss has given everyone a special holiday,so we _ go to work tomorrow.(,上海,2007,春,),A.cant B.mustnt,C.neednt D.shouldnt,12.Some aspects of a pilots job _ be boring,and pilots often _ work at inconvenient hours.(,湖南,2006),A.can;have to B.may;can,C.have to;may D.ought to;must,must;oughtnt to;dont have to;couldnt;,mustnt;neednt;cant;have to,用所给的情态动词填空。,1.You _ go on,working because you look so tired now.,2.The weather turned out to be fine,yesterday.I _ have had the,trouble to carry my umbrella with me.,oughtnt to/dont have to,neednt,练习坊,must;oughtnt to;dont have to;couldnt;,mustnt;neednt;cant;have to,3.If you earn more than,5,000,you,_ pay tax.,4.You _ play now!You shall finish,your homework first!,5.I know things are hard with you,but,you _ try to get over the difficulties.,have to,mustnt,must/have to,must;oughtnt to;dont have to;couldnt;,mustnt;neednt;cant;have to,6.I didnt see her at the meeting this,morning;she _ have,spoken at the meeting.,couldnt/cant,Homework,Finish Using Structures on Page 50 of Workbook.,